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WO2017078285A1 - Émetteur d'énergie sans fil - Google Patents

Émetteur d'énergie sans fil Download PDF

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Publication number
WO2017078285A1
WO2017078285A1 PCT/KR2016/011405 KR2016011405W WO2017078285A1 WO 2017078285 A1 WO2017078285 A1 WO 2017078285A1 KR 2016011405 W KR2016011405 W KR 2016011405W WO 2017078285 A1 WO2017078285 A1 WO 2017078285A1
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WO
WIPO (PCT)
Prior art keywords
wireless power
distance
coil
transmission
transmitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2016/011405
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English (en)
Korean (ko)
Inventor
배수호
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LG Innotek Co Ltd
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LG Innotek Co Ltd
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Filing date
Publication date
Application filed by LG Innotek Co Ltd filed Critical LG Innotek Co Ltd
Priority to US15/766,311 priority Critical patent/US20180294673A1/en
Publication of WO2017078285A1 publication Critical patent/WO2017078285A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters

Definitions

  • the present invention relates to a wireless power transmission technology, and more particularly, to a wireless power transmitter that can improve performance by improving the efficiency of wireless power transmission.
  • Wireless power transmission or wireless energy transfer is a technology that transmits electrical energy wirelessly from a transmitter to a receiver using the principle of induction of magnetic field, which is already used by electric motors or transformers using the electromagnetic induction principle in the 1800s. Since then, there have been attempts to transmit electrical energy by radiating electromagnetic waves such as radio waves and lasers. Electric toothbrushes and some wireless razors that we commonly use are actually charged with the principle of electromagnetic induction.
  • energy transmission using wireless may be classified into magnetic induction, electromagnetic resonance, and RF transmission using short wavelength radio frequency.
  • the magnetic induction method uses the phenomenon that magnetic flux generated at this time causes electromotive force to other coils when two coils are adjacent to each other and current flows to one coil, and is rapidly commercialized in small devices such as mobile phones. Is going on. Magnetic induction is capable of transmitting power of up to several hundred kilowatts (kW) and has high efficiency, but the maximum transmission distance is less than 1 centimeter (cm).
  • the magnetic resonance method is characterized by using an electric or magnetic field instead of using electromagnetic waves or current. Since the magnetic resonance method is hardly affected by the electromagnetic wave problem, it has the advantage of being safe for other electronic devices or the human body. On the other hand, it can be utilized only in limited distances and spaces, and has a disadvantage in that energy transmission efficiency is rather low.
  • the short wavelength wireless power transmission scheme implies, the RF transmission scheme— takes advantage of the fact that energy can be transmitted and received directly in the form of RadioWave.
  • This technology is a wireless power transmission method of the RF method using a rectenna, a compound word of an antenna and a rectifier (rectifier) refers to a device that converts RF power directly into direct current power.
  • the RF method is a technology that converts AC radio waves to DC and uses them. Recently, research on commercialization has been actively conducted as efficiency is improved.
  • Wireless power transfer technology can be used in various industries, such as the mobile, IT, railroad and consumer electronics industries.
  • the plurality of coils may be formed in a plurality of layers.
  • the efficiency of the wireless power transmission is dependent on the distance between the coil and the surface on which the wireless power receiver is placed. That is, the wireless power transmission efficiency of the coil located at the lower part far from the wireless power receiver among the plurality of coils becomes relatively small, resulting in performance degradation.
  • the present invention has been devised to solve the above problems of the prior art, and an object of the present invention is to provide a wireless power transmitter.
  • Another object of the present invention is to provide a wireless power transmitter capable of improving wireless power transmission efficiency of a transmission coil belonging to a lower layer.
  • a wireless power transmitter includes a first transmitting coil and a second region including a first region spaced a first distance from an interface surface and a second region spaced a second distance from the interface surface. And a second transmission coil overlapping the region, wherein the first distance is smaller than the second distance.
  • the first transmitting coil may be bent toward the interface surface.
  • an average distance between the first transmission coil and the interface surface may be smaller as the ratio of the horizontal length of the first region to the total horizontal length of the first transmission coil is increased.
  • the average distance between the first transmitting coil and the interface surface may be smaller as the ratio of the area of the first area to the total area of the first transmitting coil is larger.
  • the difference between the first distance and the second distance may be a thickness of the first transmission coil.
  • it may further include a third transmission coil having a symmetrical structure with the first transmission coil.
  • a wireless power transmitter includes a first transmission coil including a first area spaced a first distance from an interface surface and a second area spaced a second distance from the interface surface, and the first transmission coil; And a second transmission coil overlapping one region in a horizontal direction, wherein the first distance may be smaller than the second distance.
  • the wireless power transmitter by implementing a bent form of the coil located in the lower portion of the overlapping coil to reduce the average distance between the coil and the interface surface can improve the wireless power transmission efficiency It works.
  • the wireless power transmitter by reducing the average distance between the coil and the interface surface by implementing the bent coil in the lower form, the power consumption for transmitting the detection signal can be reduced Power transmission efficiency can be increased.
  • FIG. 1 is a view for explaining a detection signal transmission procedure in a wireless power transmitter according to an embodiment of the present invention.
  • FIG. 2 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.
  • 3 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard.
  • FIG. 4 is a view for explaining a wireless charging system of the electromagnetic induction method according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a transmitting coil according to an embodiment of the present invention.
  • FIG. 6 is a view for explaining a method of manufacturing a transmitting coil layer according to an embodiment of the present invention.
  • FIG. 7 is a front view of the transmitting coil layer illustrated in FIG. 6.
  • a wireless power transmitter includes a first transmission coil and a first region including a first region spaced a first distance from an interface surface and a second region spaced a second distance from the interface surface. And a second transmission coil overlapping the two regions, wherein the first distance may be smaller than the second distance.
  • the top (bottom) or the bottom (bottom) is the two components are in direct contact with each other or One or more other components are all included disposed between the two components.
  • up (up) or down (down) may include the meaning of the down direction as well as the up direction based on one component.
  • the apparatus for transmitting wireless power on the wireless power system is a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmitter, a wireless power transmitter, and the like will be used interchangeably.
  • a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, a receiver, a receiver Or the like can be used in combination.
  • the transmitter according to the present invention may be configured in a pad form, a cradle form, an access point (AP) form, a small base station form, a stand form, a ceiling buried form, a wall hanging form, and the like. You can also transfer power.
  • the transmitter may comprise at least one wireless power transmission means.
  • the wireless power transmission means may use various wireless power transmission standards based on an electromagnetic induction method that generates a magnetic field in the power transmitter coil and charges using the electromagnetic induction principle in which electricity is induced in the receiver coil under the influence of the magnetic field.
  • the wireless power transmission means may include a wireless charging technology of the electromagnetic induction method defined by the Wireless Power Consortium (WPC) and the Power Matters Alliance (PMA) which is a wireless charging technology standard apparatus.
  • WPC Wireless Power Consortium
  • PMA Power Matters Alliance
  • the receiver according to an embodiment of the present invention may be provided with at least one wireless power receiving means, and may simultaneously receive wireless power from two or more transmitters.
  • the wireless power receiving means may include an electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) and the Power Matters Alliance (PMA), which are wireless charging technology standard organizations.
  • WPC Wireless Power Consortium
  • PMA Power Matters Alliance
  • the receiver according to the present invention is a mobile phone, smart phone, laptop computer, digital broadcasting terminal, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), navigation, MP3 player, electric It may be used in a small electronic device such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing bobber, a wearable device such as a smart watch, but is not limited thereto. If the device is equipped with a wireless power receiver according to the present invention, the battery can be charged. It is enough.
  • FIG. 1 is a view for explaining a detection signal transmission procedure in a wireless power transmitter according to an embodiment of the present invention.
  • the wireless power transmitter may be equipped with three transmitting coils 111, 112, and 113. Each transmission coil may overlap some other area with another transmission coil, and the wireless power transmitter may detect a predetermined detection signal 117, 127 for detecting the presence of the wireless power receiver through each transmission coil, for example, Digital ping signals are sent sequentially in a predefined order.
  • the wireless power transmitter sequentially transmits a sensing signal 117 through a primary sensing signal transmitting procedure shown in FIG. 110, and receives a signal strength indicator from the wireless power receiver 115.
  • the strength indicator 116 can identify the received transmission coils 111, 112.
  • the wireless power transmitter sequentially transmits the detection signal 127 through the secondary detection signal transmission procedure shown in FIG. 120, and transmits power among the transmission coils 111 and 112 where the signal strength indicator 126 is received.
  • the reason why the wireless power transmitter performs two sensing signal transmission procedures is to more accurately identify which transmitting coil is well aligned with the receiving coil of the wireless power receiver.
  • the wireless power transmitter If the signal strength indicators 116 and 126 are received in the first transmitting coil 111 and the second transmitting coil 112, as shown in reference numerals 110 and 120 of FIG. 1, the wireless power transmitter. Based on the signal strength indicator 126 received at each of the first transmitting coil 111 and the second transmitting coil 112 selects the best-aligned transmitting coil, and performs wireless charging using the selected transmitting coil. .
  • FIG. 2 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.
  • power transmission from a transmitter to a receiver according to the WPC standard can be divided into a selection phase 210, a ping phase 220, an identification and configuration phase 230, It may be divided into a power transfer phase 240.
  • the selection step 210 may be a step of transitioning when a specific error or a specific event is detected while starting or maintaining power transmission.
  • the transmitter may monitor whether an object exists on the interface surface. If the transmitter detects that an object is placed on the interface surface, the transmitter may transition to the ping step 220 (S201).
  • the transmitter transmits an analog ping signal of a very short pulse, and detects whether an object exists in an active area of the interface surface based on a change in current of a transmitting coil.
  • the transmitter activates the receiver and sends a digital ping to identify whether the receiver is a receiver that is compliant with the WPC standard. If the transmitter does not receive a response signal for the digital ping (eg, signal strength indicator) from the receiver in the ping step 220, it may transition back to the selection step 210 (S202). In addition, in the ping step 220, when the transmitter receives a signal indicating that the power transmission is completed, that is, the charging completion signal, the transmitter may transition to the selection step 210 (S203).
  • a response signal for the digital ping eg, signal strength indicator
  • the transmitter may transition to the identification and configuration step 230 for collecting receiver identification and receiver configuration and status information (S204).
  • the transmitter receives an unexpected packet, a desired packet has not been received for a predefined time, a packet transmission error, or a power transmission contract. If this is not set (no power transfer contract) it may transition to the selection step 210 (S205).
  • the transmitter may transition to the power transmission step 240 for transmitting the wireless power (S206).
  • the transmitter receives an unexpected packet, an outgoing desired packet for a predefined time, or a violation of a predetermined power transmission contract occurs. transfer contract violation), if the filling is completed, the transition to the selection step (210) (S207).
  • the transmitter may transition to the identification and configuration step 230 (S208).
  • the power transmission contract may be set based on state and characteristic information of the transmitter and the receiver.
  • the transmitter state information may include information about the maximum amount of power that can be transmitted, information about the maximum number of receivers that can be accommodated, and the receiver state information may include information about required power.
  • 3 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard.
  • power transmission from a transmitter to a receiver according to the PMA standard is divided into a standby phase (310), a digital ping phase (320), an identification phase (330), and a power transmission.
  • the operation may be divided into a power transfer phase 340 and an end of charge phase 350.
  • the waiting step 310 may be a step of transitioning when a specific error or a specific event is detected while performing a receiver identification procedure for power transmission or maintaining power transmission.
  • specific errors and specific events will be apparent from the following description.
  • the transmitter may monitor whether an object exists on a charging surface. If the transmitter detects that an object is placed on the charging surface or the RXID retry is in progress, the transmitter may transition to the digital ping step 320 (S301).
  • RXID is a unique identifier assigned to a PMA compatible receiver.
  • the transmitter transmits a very short pulse of analog ping, and an object is placed on the active surface of the interface surface-for example, the charging bed-based on the current change of the transmitting coil. You can detect if it exists.
  • the transmitter transitioned to the digital ping step 320 sends a digital ping signal to identify whether the detected object is a PMA compatible receiver.
  • the receiver may modulate the received digital ping signal according to the PMA communication protocol to transmit a predetermined response signal to the transmitter.
  • the response signal may include a signal strength indicator indicating the strength of the power received by the receiver.
  • the receiver may transition to the identification step 330 (S302).
  • the transmitter may transition to the standby step 310.
  • the Foreign Object may be a metallic object including coins, keys, and the like.
  • the transmitter may transition to the waiting step 310 if the receiver identification procedure fails or the receiver identification procedure needs to be re-executed and if the receiver identification procedure has not been completed for a predefined time ( S304).
  • the transmitter transitions from the identification step 330 to the power transmission step 340 to start charging (S305).
  • the transmitter waits if the desired signal is not received within a predetermined time (Time Out), if a Foreign Object (FO) is detected, or if the voltage of the transmitting coil exceeds a predefined reference value. It may transition to 310 (S306).
  • the transmitter may transition to the charging completion step 350 (S307).
  • the transmitter may transition to the standby state 310 (S309).
  • the transmitter may transition from the charging completion step 350 to the digital ping step 320 (S310).
  • the transmitter when the transmitter receives an end of charge (EOC) request from the receiver, the transmitter may transition to the charging completion step 350 (S308 and S311).
  • EOC end of charge
  • FIG. 4 is a view for explaining a wireless charging system of the electromagnetic induction method according to an embodiment of the present invention.
  • an electromagnetic induction type wireless charging system includes a wireless power transmitter 400 and a wireless power receiver 450.
  • the wireless power transmitter 400 and the wireless power receiver 450 are substantially the same as the wireless power transmitter and the wireless power receiver described with reference to FIG. 1, respectively.
  • the coils of the wireless power transmitter 400 and the wireless power receiver 450 may be coupled to each other by an electromagnetic field.
  • the wireless power transmitter 400 may modulate the power signal and change the frequency to generate an electromagnetic field for power transmission.
  • the wireless power receiver 450 receives power by demodulating an electromagnetic signal according to a protocol set to be suitable for a wireless communication environment, and controls the power output strength of the wireless power transmitter 400 based on the received power.
  • the feedback signal may be transmitted to the wireless power transmitter 400 through in-band communication.
  • the wireless power transmitter 400 may increase or decrease the transmission power by controlling an operating frequency according to a control signal for power control.
  • the amount (or increase / decrease) of the transmitted power may be controlled using a feedback signal transmitted from the wireless power receiver 450 to the wireless power transmitter 400.
  • communication between the wireless power receiver 450 and the wireless power transmitter 400 is not limited to in-band communication using the above-described feedback signal, but out of band having a separate communication module. It may also be achieved using -of-band communication.
  • a short range wireless communication module such as Bluetooth, Bluetooth Low Energy (BLE), NFC, or Zigbee may be used.
  • a frequency modulation scheme may be used as a protocol for exchanging state information and control signals between the wireless power transmitter 400 and the wireless power receiver 450.
  • the device identification information, the charging state information, the power control signal, etc. may be exchanged through the protocol.
  • the wireless power transmitter 400 may sense a feedback signal transmitted from the signal generator 420 and the wireless power receiver 450 that generate a power signal.
  • Coil L1 and capacitors C1 and C2 located between power supply terminals V_Bus and GND, and switches SW1 and SW2 whose operation is controlled by the signal generator 420.
  • the signal generator 420 controls the demodulator 424 for demodulating the feedback signal transmitted through the coil L1, the frequency driver 426 for changing the frequency, the modulator 424, and the frequency driver 426. It may be configured to include a transmission control unit 422 for.
  • the feedback signal transmitted through the coil L1 is demodulated by the demodulator 424 and then input to the transmission control unit 422, and the transmission control unit 422 controls the frequency driver 426 based on the demodulated signal.
  • the frequency of the power signal transmitted to the coil L1 may be changed.
  • the wireless power receiver 450 includes a modulator 452 for transmitting a feedback signal through the coil L2, a rectifier 454 for converting an AC signal received through the coil L2 into a DC signal, It may include a receiving controller 460 for controlling the modulator 452 and the rectifier 454.
  • the reception controller 460 is a power supply unit 462 for supplying power required for the operation of the rectifier 454 and other wireless power receiver 450, the rectifier 454 is the output DC voltage of the charge target (load, 468) Providing the wireless power transmitter 400 with the DC-DC converter 464 for changing the DC voltage to meet the charging requirements, the load 468 for outputting the converted power, and the received power state and the state of the charging target. It may include a feedback communication unit 466 for generating a feedback signal for.
  • the coil L1 included in the wireless power transmitter 400 refers to three transmission coils 111, 112, and 113 illustrated in FIG. 1, and a switch (eg, a switch connected to the transmission coils 111, 112, and 113).
  • SW1 and SW2 and the capacitors C1 and C2 may be provided independently for each of the transmission coils 111, 112, and 113, but the scope of the present invention is not limited thereto.
  • FIG. 5 is a diagram illustrating a transmitting coil according to an embodiment of the present invention.
  • the transmitting coil 500 has a conductive wire (for example, copper) located at the center thereof, and an electric wire in which an insulating coating (for example, fiber or plastic material) is wrapped around the conductive coil. It can be implemented in a structure wound around this concentric circle.
  • a conductive wire for example, copper
  • an electric wire in which an insulating coating (for example, fiber or plastic material) is wrapped around the conductive coil. It can be implemented in a structure wound around this concentric circle.
  • the transmitting coil 500 is illustrated in FIG. 5 as a concentric rectangular structure, the scope of the present invention is not limited thereto and may be implemented in various structures such as a concentric spiral structure or an octagonal structure.
  • the first terminal 510 may be formed at the inner end of the transmitting coil 500, and the second terminal 520 may be formed at the outer end of the transmitting coil 500.
  • the first terminal 510 and the second terminal 520 correspond to both ends of the coil L1 illustrated in FIG. 4, and may be connected to the control circuit board.
  • the control circuit board corresponds to a board including components for controlling the operation of the wireless power transmitter 400 such as the switches SW1 and SW2 and the signal generator 420.
  • FIG. 6 is a view for explaining a method of manufacturing a transmitting coil layer according to an embodiment of the present invention.
  • FIG. 7 is a front view of the transmitting coil layer illustrated in FIG. 6.
  • the transmission coil layer may include first to third coils 610, 620, and 630.
  • Each of the first to third transmission coils 610, 620, and 630 is implemented with the transmission coil 500 illustrated in FIG. 5, and a dead spot that is a region where wireless charging is possible and the charging is impossible. It may be arranged overlapped with each other so that this does not occur. As a result, the first to third transmission coils 610, 620, and 630 form at least two or more layers.
  • the conducting wires constituting each of the first to third transmission coils 610, 620, and 630 are insulated with an insulating coating, the first to third transmission coils 610, 620, and 630 may be in close contact with each other.
  • the first transmitting coil 610 and the third transmitting coil 630 may be symmetrically disposed about the second transmitting coil 620, and the second transmitting coil 620 is an outer boundary of the wireless power transmitter. There may be a distance spaced apart from the interface surface 600, on which the wireless power receiver may be placed. In the space of the predetermined distance, a case for forming an external appearance of the wireless power transmitter and protecting an internal configuration may be provided.
  • the third transmission coil 630 has a symmetrical structure substantially the same as the first transmission coil 610, only the structure of the first transmission coil 610 will be described in detail with reference to FIG. 6.
  • the first transmitting coil 610 may include a first area and a second area, wherein the first area is an area where the distance (shortest distance) from the interface surface 600 is the first distance D1 and the first area.
  • the second region is the region where the distance (shortest distance) from the interface surface 600 is the second distance D2.
  • the difference between the second distance D2 and the first distance D1 is illustrated as being the thickness of the first transmission coil 610, but the scope of the present invention is not limited thereto.
  • the first transmitting coil 610 may have a bent shape toward the interface surface 600, and the bent corner is shown to be vertically bent in FIG. 6, but may have a smooth shape.
  • At least a portion of the first region may overlap the second transmission coil 620 in the horizontal direction, and at least a portion of the second region may overlap the second transmission coil 620 in the vertical direction.
  • the first transmission coil 610 is assumed to have a straight shape such that the distance from the interface surface 600 is the second distance D2, unlike in FIG. 6, the first transmission coil ( The average distance between 610 and the interface surface 600 becomes the second distance D2.
  • A is the horizontal length of the first region
  • B corresponds to the horizontal length of the second region.
  • the distance D_DCR of the interface surface 600 in which the first transmission coil 610 is reduced compared to the comparative example may be calculated by Equation 2 below.
  • the average between the first transmitting coil 610 and the interface surface 600 is increased.
  • the distance D_AVR can be made smaller.
  • the matching between the transmitting coil and the receiving coil has a great influence on the wireless power transmission efficiency, and the closer the distance between the transmitting coil and the receiving coil is, the wireless power transmission efficiency increases.
  • the average distance between the first transmitting coil 610 and the interface surface 600 is 3.5 mm and the wireless power transmission efficiency is 59. May be%.
  • the average distance between the second transmission coil 620 and the interface surface 600 may be 2mm and the wireless power transmission efficiency may be 62%.
  • the average distance between the first transmission coil 610 and the interface surface 600 according to an embodiment of the present invention is 2.75 mm by Equation 1
  • the reduced distance is 0.75 mm by Equation 2.
  • the first transmission coil 610 according to the embodiment of the present invention is reduced in distance from the interface surface 600 by 0.75 mm due to the bent shape, and the wireless power transmission efficiency may be improved from 59% to 60.7%. Can be.
  • the wireless power transmission efficiency may be improved.
  • a phenomenon in which the wireless power transmission efficiency of the transmission coil belonging to the lower layer is relatively lowered may occur.
  • a coil positioned below the overlapping coils may be bent to reduce the average distance between the coil and the interface surface, thereby improving wireless power transmission efficiency. It can be effective.
  • each of the transmitting coils 610, 620, 630 transmits the sensing signals 117, 127 described in FIG. 1 in the standby mode, which is identical to the sensing signals 177, 127 with respect to the interface surface 600.
  • Receive sensitivity should be implemented. Since the signal is attenuated as the transmission distance increases, the voltage applied to the lower transmission coils 610 and 630 should be greater than the voltage applied to the upper transmission coil 620.
  • the wireless power transmitter by implementing a coil located in the lower portion of the bent form to reduce the average distance between the coil and the interface surface power consumption for the transmission of the detection signal can be reduced Power transmission efficiency can be increased.
  • FIG. 7 shows a front view of the transmitting coil layer from the interface surface 600.
  • the second transmission coil 620 and the first and third transmission coils 610 and 630 may be disposed to overlap each other so that a dead spot does not occur.
  • the transmission coil layer illustrated in FIG. 6 corresponds to a cross section vertically cut along the straight line S-S ′ of FIG. 7.
  • each of the transmission coils 610, 620, and 630 is implemented in a rectangular shape having different horizontal lengths and vertical lengths is illustrated.
  • an area 640 that is located on the same line as the second area of FIG. 6 but does not overlap with the second transmission coil 620 is generated, but does not overlap with the second transmission coil 620.
  • it may be implemented in a bent shape such that the distance to the interface surface 600 is the first distance D1.
  • the distance from the interface surface 600 is the first distance D1. It may be implemented in a bent form to be.
  • the scope of the present invention is not limited to the shape and arrangement of the respective transmission coils 610, 620, and 630 of FIG. 7, and such a structure may be applied regardless of the shape and arrangement.
  • the average distance D_AVR 'between the first transmitting coil 610 and the interface surface 600 can be calculated by the following equation (3).
  • C is the area of the first region
  • D corresponds to the area of the second region
  • the distance D_DCR 'of the first transmission coil 610 according to the embodiment of the present invention is reduced compared to the comparative example mentioned in FIG. 6 by the following equation (4). Can be calculated.
  • the average distance between the first transmission coil 610 and the interface surface 600 ( D_AVR ') can be made small.
  • the wireless power transmitter according to an embodiment of the present invention, by implementing an area except for the overlapped area of the coil located below the overlapping coils in a bent form by reducing the average distance between the coil and the interface surface There is an effect that can improve the wireless power transmission efficiency.
  • the method according to the embodiment described above may be stored in a computer-readable recording medium that is produced as a program for execution on a computer, and examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape , Floppy disks, optical data storage devices, and the like, and also include those implemented in the form of carrier waves (eg, transmission over the Internet).
  • the computer readable recording medium can be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.
  • functional programs, codes, and code segments for implementing the above-described method may be easily inferred by programmers in the art to which the embodiments belong.
  • the present invention relates to a wireless charging technology, can be applied to a wireless power transmission device for transmitting power wirelessly.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention porte sur une technique de transmission d'énergie sans fil et, plus précisément, sur un émetteur d'énergie sans fil qui permet d'améliorer le rendement de transmission d'énergie sans fil afin d'améliorer son fonctionnement. Un émetteur d'énergie sans fil selon un mode de réalisation de la présente invention comprend : une première bobine d'émission qui comprend une première zone espacée d'une surface d'interface par une première distance, et une seconde zone espacée de la surface d'interface par une seconde distance; une seconde bobine d'émission qui chevauche la seconde zone, la première distance pouvant être inférieure à la seconde distance.
PCT/KR2016/011405 2015-11-02 2016-10-12 Émetteur d'énergie sans fil Ceased WO2017078285A1 (fr)

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US15/766,311 US20180294673A1 (en) 2015-11-02 2016-10-12 Wireless power transmitter

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KR10-2015-0153231 2015-11-02
KR1020150153231A KR20170050991A (ko) 2015-11-02 2015-11-02 무선 전력 송신기

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WO (1) WO2017078285A1 (fr)

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KR102085646B1 (ko) 2018-03-05 2020-03-06 주식회사 아모센스 무선전력 송신장치
KR102241360B1 (ko) * 2018-07-12 2021-04-15 연세대학교 산학협력단 무선 전력 송신 장치와 이를 구비하는 무선 전력 전송 시스템, 및 무선 전력 수신 장치
KR102607259B1 (ko) * 2018-08-23 2023-11-29 삼성전자주식회사 무선 전력 송신 장치, 무선으로 전력을 수신하는 전자 장치 및 그 제어 방법
US10658878B2 (en) 2018-08-31 2020-05-19 Apple Inc. Wireless charging system with temperature sensor array
WO2021042049A1 (fr) * 2019-08-30 2021-03-04 Optimus Ride, Inc. Système et procédé d'attribution de dispositif de surveillance
US11646606B2 (en) * 2021-01-22 2023-05-09 Microsoft Technology Licensing, Llc Receive and transmit coil pair selection

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KR20150109391A (ko) * 2013-01-18 2015-10-01 퀄컴 인코포레이티드 멀티 코일 동작 및 최적화의 방법

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KR20170050991A (ko) 2017-05-11

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